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Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2024
USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance $ 1,151
Ending balance 1,130
Device payment plan agreement  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 1,151
Current period provision for expected credit losses 1,041
Write-offs charged against the allowance (1,090)
Recoveries collected 28
Ending balance 1,130
Wireless Service Plan Receivables  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance 213
Current period provision for expected credit losses 400
Write-offs charged against the allowance (408)
Recoveries collected 32
Ending balance $ 237